Question

your assignment in biology lab is to design an experiment that would detect whether a substance is breaking down, or digesting, a protein. which of the following experimental designs would be your best choice?
a. test tube a: water and egg white
test tube b: water, egg white, and pepsin
procedure: test the ph of both tubes at the same temperatures for consistency
b. test tube a: water and soy protein
test tube b: water, egg white, and pepsin
test tube c: water, egg white, acid, and pepsin
procedure: observe each test tube for changes in the protein every 15 minutes
c. test tube a: water and egg white
test tube b: water, egg white, weak acid, and pepsin
test tube c: water, egg white, strong acid, and pepsin
procedure: record the mass of the egg white in each test tube before you begin. measure the egg whites every 15 minutes

Explanation:

To detect protein digestion, a control (tube with just protein and water) and experimental tubes with protein, pepsin (a prote - ase), and different conditions are needed. Measuring the mass of the protein over time in different conditions (control and experimental with varying acid strengths) is a good way to see if the protein is being broken down. Option C has a control and experimental tubes with different acid - pepsin combinations and measures the mass of the protein over time.

Answer:

C. Test tube A: Water and egg white
Test tube B: Water, egg white, weak acid, and pepsin
Test tube C: Water, egg white, strong acid, and pepsin
Procedure: Record the mass of the egg white in each test tube before you begin. Measure the egg whites every 15 minutes